3results about How to "Reduce benzene content" patented technology

This utility model discloses a chlorinator for chlorobenzene production, belonging to the field of chlorobenzene production technology. It includes a first cylinder and a second cylinder arranged sequentially from bottom to top. The first cylinder has a skirt at its bottom, which is bolted to the ground. The lower part of the second cylinder is conical, and its lower end is bolted to the first cylinder via a flange. The top of the second cylinder has a sealing head, which is bolted to the second cylinder via a flange. The diameter of the second cylinder is larger than that of the first cylinder. This utility model increases the diameter of the second cylinder from its connection point with the first cylinder upwards, enlarging the top space of the chlorinator and allowing it to fully utilize its gas-liquid separation function. This allows hydrogen chloride gas and benzene vapor to separate from the crude chlorination liquid, reducing the benzene content in the hydrogen chloride gas, decreasing benzene consumption, and simultaneously enhancing the purification effect of the crude chlorination liquid, thereby increasing product yield.

The invention discloses a method and a system for separating and removing benzene from a benzene selective hydrogenation reaction product. The method comprises the following steps: introducing benzene selective hydrogenation reaction slurry and a lean solvent containing sulfolane and water into an extractive distillation tower for benzene extraction separation to obtain an alkane olefin product which flows out from the top of the extractive distillation tower; the benzene-containing lean solvent flows out of the tower kettle of the extractive distillation tower and then is introduced into a solvent recovery tower for distillation separation of benzene and sulfolane, benzene flows out of the tower top of the solvent recovery tower, sulfolane flows out of the tower kettle of the solvent recovery tower and then is divided into two parts, one part is directly recycled for benzene extraction separation, and the other part is directly recycled for sulfolane separation. Introducing the other part of sulfolane into a solvent regeneration tank for distillation and purification, and returning the purified sulfolane to the tower kettle of the solvent recovery tower; the alkane olefin product is directly used for a technology for preparing cyclohexanone through cyclohexene esterification and hydrogenation. The alkane olefin product obtained by the method is high in purity, low in benzene content, simple in process, low in cost, green and environment-friendly, and the provided adaptive system meets the continuous production requirement and is suitable for industrial application.

This invention discloses a method for improving crude benzene yield, belonging to the field of coke oven gas purification and crude benzene recovery technology. The method includes: S1, gas pretreatment: after primary cooling, the coke oven gas enters the final cooler, where it is cleaned by circulating ammonia water spraying, controlling the gas temperature after final cooling to 20℃~25℃; S2, dual-tower series deep absorption: the pretreated gas sequentially enters a primary benzene washing tower and a secondary benzene washing tower for series absorption; the wash oil adopts a reverse cascade utilization method, i.e., lean oil is first finely absorbed by the secondary benzene washing tower, and then enters the primary benzene washing tower for main absorption; S3, pressure and flow control: a pressure balancing pipe and an electric regulating valve are installed between the primary and secondary benzene washing towers to maintain a stable pressure difference between the two towers; a flow stabilizing orifice plate is installed on the pipeline from the outlet of the primary tower to the inlet of the secondary tower to ensure gas-liquid contact balance. This invention employs a dual-tower series deep benzene washing process, which can significantly reduce benzene series emissions and improve crude benzene yield.